Member function pointers in CINT / PyROOT / reflex

ROOT
1

Hello,

I am trying to instantiate a class that uses member function pointers in CINT and PyROOT after creating a dictionary for it. Is this possible? Please find the class definition below and the reflex file attached.

Thank you in advance,
Bruno

namespace HggReader {
  class HggD3PDCutFlow;
  typedef bool (HggD3PDCutFlow::*HGGc0)(void);
  typedef bool (HggD3PDCutFlow::*HGGc1)(int);

  class HggCut
  {
  public:
    HggCut() : name(""), onEvent(0), onPair(0), onPhoton(0) {};
    HggCut(std::string n, HGGc0 a, HGGc1 b = 0, HGGc1 c = 0) : name(n), onEvent(a), onPair(b), onPhoton(c) {};
    virtual ~HggCut() {};
    std::string name;
    // Pointers to HGGD3PDCutFlow cuts
    HGGc0 onEvent;
    HGGc1 onPair, onPhoton;
  };
}

root [0] HggCut c1 Error: class,struct,union or type bool(HggReader not defined {CINTEX dictionary translator}:-1: Error: class,struct,union or type bool(HggReader not defined {CINTEX dictionary translator}:-1: Error: class,struct,union or type bool(HggReader not defined {CINTEX dictionary translator}:-1: Error: class,struct,union or type bool(HggReader not defined {CINTEX dictionary translator}:-1: Error: class,struct,union or type bool(HggReader not defined {CINTEX dictionary translator}:-1: Error: class,struct,union or type bool(HggReader not defined {CINTEX dictionary translator}:-1:
HGGReader_rflx.cxx (620 KB)

2

Bruno,

Reflex supports them, but PyROOT does not. Is on my TODO list. Dunno about CINT, I’ll let Axel field that. :slight_smile:

Cheers,
Wim

3

Thanks Wim. Let’s wait to hear about CINT.

Cheers,
Bruno

4

Hi,

Your example works fine when the dictionary is generated via rootcint.

Philippe.

5

Hi Philippe,

Thanks, indeed it seems to work. Now I see a difference between interactive and compiled code when testing a null pointer. Do you understand or maybe there is error on what I am doing?

Thanks again,
Bruno

Interactively:

root [0] gSystem->Load("HggCut_h.so");
root [1] HGGc0 c0; 
root [2] cout << (c0 == 0) << endl;
0

While the compiled code gives:

root [0] .L test_HggCut.C+             
Info in <TUnixSystem::ACLiC>: creating shared library /home/blenzi/teste/./test_HggCut_C.so
In file included from /home/blenzi/teste/test_HggCut_C_ACLiC_dict.h:34,
                 from /home/blenzi/teste/test_HggCut_C_ACLiC_dict.cxx:16:
/home/blenzi/teste/./HggCut.h: In function ‘void test_HggCut()’:
/home/blenzi/teste/./HggCut.h:15: warning: ‘c0.bool (HggD3PDCutFlow::*)()::__delta’ may be used uninitialized in this function
/home/blenzi/teste/./test_HggCut.C:10: note: ‘c0.bool (HggD3PDCutFlow::*)()::__delta’ was declared here
/home/blenzi/teste/./HggCut.h:15: warning: ‘c0.bool (HggD3PDCutFlow::*)()::__pfn’ may be used uninitialized in this function
/home/blenzi/teste/./test_HggCut.C:10: note: ‘c0.bool (HggD3PDCutFlow::*)()::__pfn’ was declared here
/home/blenzi/teste/./HggCut.h:15: warning: ‘c1.bool (HggD3PDCutFlow::*)(int)::__delta’ may be used uninitialized in this function
/home/blenzi/teste/./test_HggCut.C:11: note: ‘c1.bool (HggD3PDCutFlow::*)(int)::__delta’ was declared here
/home/blenzi/teste/./HggCut.h:15: warning: ‘c1.bool (HggD3PDCutFlow::*)(int)::__pfn’ may be used uninitialized in this function
/home/blenzi/teste/./test_HggCut.C:11: note: ‘c1.bool (HggD3PDCutFlow::*)(int)::__pfn’ was declared here
root [1] test_HggCut()
1
1
1
1

test_HggCut.C (516 Bytes)
HggCut.h (1.71 KB)

6

Hi,

root [1] HGGc0 c0; Since c0 is not initialized, the value should be considered random …

Cheers,
Philippe.

7

Hi,

You are right, sorry. What I want is actually to instantiate a “null” HggCut (with null pointers to member functions):

HGGc0 c0 = 0; 
HGGc1 c1 = 0;
HggCut C0("test", c0, c1, c1);
HggCut C2("test0", (HGGc0) 0, (HGGc1) 0, (HGGc1) 0);

But the comparision still yields false interactively:

root [1] HGGc0 c0 = (HGGc0) 0;        
root [2] c0 == 0                      
(int)0
root [3] HGGc1 c1 = 0;
root [4] HggCut C0("test", c0, c1, c1);
root [5] cout << (C0.onEvent == 0) << endl;
0

And if I try to instantiate HggCut interactively casting a null pointer it crashes without giving a message:

root [6] HggCut a("test", (HGGc0) 0, (HGGc1) 0, (HGGc1) 0)

 *** Break *** segmentation violation
Root >

Thanks again,
Bruno

8

Hi Bruno,

The comparison and assignment of member function pointer to zero is fixed in revision 39322 of the trunk.

Cheers,
Philippe.

9

Hi Bruno,

And the constructor segfault is fixed by revision 39323.

Cheers,
Philippe.